768 research outputs found
The Effects of Nanostructure on the Hydrogen Sorption Properties of Magnesium-Based Metallic Compounds: A Review
No full textIn this review, I examine the influence of nanoscale materials features on the hydrogen-metal interaction. The small system size, the abundance of surfaces/interfaces, and the spatial distribution of phases are the key factors to understand the hydrogen sorption properties of nanomaterials. In order to describe nanoscale-specific thermodynamic changes, I present a quantitative model applicable to every hydride-forming material, independently on its composition and atomic structure. The effects of surface free energy, interface free energy, and elastic constraint, are included in a general expression for the thermodynamical bias. In the frame of this model, I critically survey theoretical and experimental results hinting at possible changes of thermodynamic parameters, and in particular, enthalpy and entropy of hydride formation, in nanostructured Mg-based metallic compounds as compared to their coarse-grained bulk counterparts. I discuss the still open controversies, such as destabilization of ultra-small clusters and enthalpy–entropy compensation. I also highlight the frequently missed points in experiments and data interpretation, such as the importance of recording full hydrogen absorption and desorption isotherms and of measuring the hysteresis. Finally, I try to address the open questions that may inspire future research, with the ambition of tailoring the properties of hydride nanomaterials through a deeper understanding of their thermodynamics
[Recueil d'arias et cantates italiennes / Giovanni Battista Tomasi, Flavio Carlo Lanciani, Gioseppe della Porta, Bernardo Pasquini, Cosimo Bani, Severo de Luca et anonymes]
No full textTitre uniforme : Tomasi, Giovanni Battista. Compositeur. [Ho voglia d'amarti]Titre uniforme : [Ch'io non pensi al bell'idolo]Titre uniforme : [Sorte, destin, amore]Titre uniforme : Lanciani, Flavio Carlo (1661-1706 ; compositeur). Compositeur. [Il giglio]Titre uniforme : Della Porta, Gioseppe. Compositeur. [Farfalla innamorata]Titre uniforme : [Vaghe labbra]Titre uniforme : [Quest'ingiurie son le furie]Titre uniforme : Pasquini, Bernardo (1637-1710). Compositeur. [La Tessalonica. Acte 3, scène 2. Con le furie ch'ho nel cuore]Titre uniforme : [Quando ritornerete sventurate mie luci]Titre uniforme : Pasquini, Bernardo (1637-1710). Compositeur. [La Tessalonica. D'un labbro canoro]Titre uniforme : Lanciani, Flavio Carlo (1661-1706 ; compositeur). Compositeur. [Dal dì che amor di violenza armato]Titre uniforme : Lanciani, Flavio Carlo (1661-1706 ; compositeur). Compositeur. [Placati omai crudele]Titre uniforme : Bani, Cosimo. Compositeur. [Il figlio delle selve. Acte 3, scène 9. Ah che una morte è poco]Titre uniforme : Bani, Cosimo. Compositeur. [Il figlio delle selve. Acte 3, scène 3. Cedi allo sdegno]Titre uniforme : Bani, Cosimo. Compositeur. [Il figlio delle selve. Acte 1, scène 1. No, bella, non paventar]Titre uniforme : De Luca, Severo. Compositeur. [Non m'ingannar se puoi]Comprend : Del Sig.r Giovan Battista Tomasi // Mantova // 88 ; Il Giglio ; Del Sig.r Gioseppe dela Porta ; Di Flavio Lanciani ; S.r Flavio Lanciani ; Del Sig.r Abb.e Bani ; Del Sig.r Abbate Bani ; Del Sig.r Ab. Bani ; Del S.r Severo de LucaRéunit 13 arias d'opéra et 3 cantates de Giovanni Battista Tomasi, Flavio Carlo Lanciani, Gioseppe della Porta, Bernardo Pasquini, Cosimo Bani, Severo de Luca. - Titre, de la main de Prunières, collé au contreplat supérieur : "Cantate di // Diversi Autori // Rac. Mss. // HP // 23". - Mentions au crayon sur la 1re f. de garde : "n° 7" (gommé) et "23". - Table de la main de Prunières à la fin. - P. 6, 7, 8, 22, 74, 86, 94, 99, 100, 112 vierges. - Plusieurs copistes. - Pagination ajoutée. - Reliure en veau granité ; dos à 4 entrenerfs, décor doré dans chaque entrenerf : encadrement de 2 filets avec fleuron central et colimaçons dans les coins ; motif doré sur les chants ; tranche mouchetée rouge et noir ; gardes en papier marbréPrésentation musicale : [Partition réduite]Appartient à l’ensemble documentaire : RISM2Appartient à l’ensemble documentaire : Chambure1Appartient à l’ensemble documentaire : RISMMssCantates pour soliste -- +* 1600......- 1699......+:17e siècle:Airs d'opéra -- +* 1600......- 1699......+:17e siècle
Il gioco delle antifrasi nell’incipit della Fiaccola sotto il moggio
No full textThe textual incipit of the second Abruzzo tragedy by Gabriele d’Annunzio, La fiaccola sotto il moggio (1905), defines its character in close relationship with three literary references: the Vangeli (of Luca, Matteo and Marco), the Coefore of Eschilo and La figlia di Iorio (1903; ed. 1904) by the poet himself. The analysis of the first portion of the dramaturgical text shows how, starting from the initial atmospheres, the author loves the game of antiphrastic references with those works, which constitute the filigree of the poetic construction through thematic and conceptual references. Above all, the inverse morality that animates Gigliola, the protagonist, emerges in relation with the evangelical premises contained in the title, as well as the subversion of the tragic order of the classical matrix which also inspires the text
Lectura Dantis Bononiensis, su progetto di Emilio Pasquini, a cura di Giuseppe Ledda
No full textIl volume raccoglie gli interventi tenuti nell'ambito della prestigiosa "Lectura Dantis Bononiensis", progettata e lungamente coordinata da Emilio Pasquini, nell'anno 2019 e relativi ai canti X-XVII del Paradiso. Interventi di Roberto Antonelli, Piero Boitani, Luca Serianni, Donato PIrovano, Nicolò Mineo, Manlio Pastore Stocchi, Marco Veglia, Emilio Pasquini
Neuroimaging of language reorganization in the preoperative setting of brain tumors
No full textNeuroplasticity is extremely relevant in the preoperative setting of brain tumors, due to the potential dramatic consequences of iatrogenic damage to eloquent cortices. The surgical resection of left-hemispheric brain tumors is often complicated by ipsilateral lateralization of language, which is usually localized in the left perisylvian region. Functional MRI (fMRI) is the most widely employed non-invasive method to evaluate language function in the preoperative planning of brain tumors, thanks to its versatility and proven clinical benefits. The implementation of functional connectivity analyses in clinical fMRI can provide new insights about the mechanisms of compensation that the brain develops in response to focal lesions. Language plasticity or reorganization may be associated with tumor growth in the dominant hemisphere for speech preservation against the detrimental effects of neoplastic invasion. Such phenomenon has important effects on patients’ outcome and life quality, including the reduction of post-surgical language deficits. In this work we explored language reorganization in the setting of brain tumors, focusing on three specific aims: 1) To demonstrate the existence of language reorganization on fMRI and to identify tumor- and patient-related determinants of language plasticity; 2) To investigate anatomical changes of the cortex in patients with language reorganization by means of structural MRI techniques; 3) To characterize different patterns of language reorganization in brain tumors by means of fMRI, graph theory and intra-operative stimulation. Our results confirmed that tumor growth in the left hemisphere is associated with inter-hemispheric language reorganization, as well as structural modifications of cortical volume in the newly activated areas. Language reorganization appears to be influenced by age, sex, frontal location, Broca’s and Wernicke’s area invasion, tumor pathology, EGFR amplification, IDH mutation, MGMT methylation, FGFR mutation. Low-grade gliomas show more favorable connectivity changes than high-grade gliomas, in terms of network efficiency and information transfer. Language reorganization develops over time in response to tumor growth or treatments, including surgery, showing progressive recruitment of the right hemisphere. Patients with surgically-proven reorganization display a shift of core language areas to the right side, and demonstrate better language performance compared to the patients who remain left-dominant
Nanostructured Materials for Energy Storage and Conversion
No full textThe conversion and storage of renewable energy sources is an urgent challenge that we need to tackle to transition from a fossil fuel-based economy to a low-carbon society [...
Design of nanomaterials for hydrogen storage
No full textThe interaction of hydrogen with solids and the mechanisms of hydride formation experience significant changes in nanomaterials due to a number of structural features. This review aims at illustrating the design principles that have recently inspired the development of new nanomaterials for hydrogen storage. After a general discussion about the influence of nanomaterials' microstructure on their hydrogen sorption properties, several scientific cases and hot topics are illustrated surveying various classes of materials. These include bulk-like nanomaterials processed by mechanochemical routes, thin films and multilayers, nano-objects with composite architectures such as core-shell or composite nanoparticles, and nanoparticles on porous or graphene-like supports. Finally, selected examples of recent in situ studies of metal-hydride transformation mechanisms using microscopy and spectroscopy techniques are highlighted
Interface Enthalpy-Entropy Competition in Nanoscale Metal Hydrides
No full textWe analyzed the effect of the interfacial free energy on the thermodynamics of hydrogen sorption in nano-scaled materials. When the enthalpy and entropy terms are the same for all interfaces, as in an isotropic bi-phasic system, one obtains a compensation temperature, which does not depend on the system size nor on the relative phase abundance. The situation is different and more complex in a system with three or more phases, where the interfaces have different enthalpy and entropy. We also consider the possible effect of elastic strains on the stability of the hydride phase and on hysteresis. We compare a simple model with experimental data obtained on two different systems: (1) bi-phasic nanocomposites where ultrafine TiH2 crystallite are dispersed within a Mg nanoparticle and (2) Mg nanodots encapsulated by different phases
The Electron in Three-Dimensional Momentum Space
No full textWe study the electron as a system composed of an electron and a photon and derive the leading-twist transverse-momentum-dependent distribution functions for both the electron and photon in the dressed electron, thereby offering a three-dimensional description of the dressed electron in momentum space. To obtain the distribution functions, we apply both the formalism of light-front wave function overlap representation and the diagrammatic approach; we discuss the comparison of our results between light-cone gauge and Feynman gauge, discussing the role of the Wilson lines to obtain gauge-independent results. We provide examples of plots of the computed distributions
Application of synchrotron radiation techniques to the study of hydrogen storage materials
No full textMaterials for reversible hydrogen storage in the solid state constitute a subject of intensive research. In this article, after an introductory discussion on hydrogen storage materials, specific examples of their investigation by means of synchrotron radiation are presented. Emphasis is given to the complementary use of X-ray diffraction and absorption techniques, and on the design of in situ experiments which permit to follow phase transformations and microstructure changes induced by hydrogen uptake and release
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